package com.hmall.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.item.mapper.ItemMapper;
import com.hmall.item.pojo.Item;
import com.hmall.item.service.IItemService;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.amqp.RabbitTemplateConfigurer;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class ItemService extends ServiceImpl<ItemMapper, Item> implements IItemService {
    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Transactional
    @Override
    public void updateStatus(Long id, Integer status) {
        this.update().set("status",status).eq("id",id).update();
        //根据status 1:上架 2:下架 来判断routingKey
        String routingKey = status ==1 ? "item.up" :"item.down";
        //发消息
        rabbitTemplate.convertAndSend("item.topic",routingKey,id);
    }

    //扣减库存
    @Override
    public void updateStock(Long itemId, Integer num) {
        //update tb_item set stock = stock -num where id = #{itemId}
        update().setSql("stock = stock-" + num).eq("id",itemId).update();
    }
}
